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Reference: Malac J, et al. (2005) Glucose-induced MDR pump resynthesis in respiring yeast cells depends on nutrient level. Biochem Biophys Res Commun 337(1):138-41

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Abstract

Glucose addition to a stationary culture of wild-type Saccharomyces cerevisiae BY4742 cells with zero activity of MDR pumps resuspended in a fresh medium causes pump resynthesis (measured as pump-effected diS-C3(3) efflux). In a stationary culture in its original growth medium, this glucose-induced pump resynthesis fails to occur due to depletion of essential nutrients or to extracellular metabolites produced by cells during growth. Direct pump inactivation by metabolites is excluded since exponential cells with high MDR pump activity cultured in a medium with high concentration of extracellular metabolites retain this activity for at least 2 h. The metabolites also do not affect pump synthesis on the level of gene expression as addition of concentrated growth medium or an amino acid mixture to stationary cells in spent growth medium restores glucose-induced pump synthesis. The block of MDR pump synthesis is therefore due to the lack of essential nutrients in spent medium.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Malac J, Sigler K, Gaskova D
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